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diff: add --inverse option...
diff: add --inverse option Most of the time, one can reverse a diff by swapping the revisions passed with -r but it happens that if you use the global -R, and diff against the tip of the current repo, you can't swap the revisions. One use-case for that is reviewing changes from a bundle before unbundling. One could also pipe the output of `hg diff` to a command line filter that reverses the diff, but that would remove the benefit from color diffs. Therefore, having an option in `hg diff` to reverse a diff is a good thing. The option flag selection was tricky. GNU patch uses -R/--reverse but -R is already used as a global option and --reverse would make --rev ambiguous.

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test-hgweb-filelog
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#!/bin/sh
hg init test
cd test
echo b > b
hg ci -Am "b"
echo a > a
hg ci -Am "first a"
hg rm a
hg ci -m "del a"
echo b > a
hg ci -Am "second a"
hg rm a
hg ci -m "del2 a"
hg mv b c
hg ci -m "mv b"
echo c >> c
hg ci -m "change c"
hg log -p
hg serve -n test -p $HGPORT -d --pid-file=hg.pid -E errors.log
cat hg.pid >> $DAEMON_PIDS
echo % tip - two revisions
("$TESTDIR/get-with-headers.py" localhost:$HGPORT '/log/tip/a')
echo % second version - two revisions
("$TESTDIR/get-with-headers.py" localhost:$HGPORT '/log/3/a')
echo % first deleted - one revision
("$TESTDIR/get-with-headers.py" localhost:$HGPORT '/log/2/a')
echo % first version - one revision
("$TESTDIR/get-with-headers.py" localhost:$HGPORT '/log/1/a')
echo % before addition - error
("$TESTDIR/get-with-headers.py" localhost:$HGPORT '/log/0/a')
echo % should show base link, use spartan because it shows it
("$TESTDIR/get-with-headers.py" localhost:$HGPORT '/log/tip/c?style=spartan')
echo % errors
cat errors.log